US1121562A - Selective signaling device. - Google Patents

Description

0. T. LADEMAN.

SELECTIVE SIGNALING SYSTEM.

APPLICATION FILED APR.30.1912.

Patented Dec. 15. 1914.

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O. T. LADEMAN.

SELEGTIVB SIGNALING SYSTEM.

APPLICATION FILED APR.30.1912.

1,1 21,562. Patented Dec.15,1914.

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UNITED STATES PATENT OFFIGE. OTTO T. LADEMAN, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO MORSE CODE SIGNAL COMPANY, OFMILWAUKE'E, WISCONSIN."

SELECTIVE SIGNALING SYSTEM.

To all whom it may concern Be it known that I, OTTO T. LADEMAN, a

waukee, in the county of Milwaukee. and State'of Wisconsin, have invented a certain new and useful Improvementin Selective Signaling Systems, of which the following is a full, clear, concise, and exact description, reference being had to the accompany- I ing drawings, forming a part of this specification.

Mv invention-relates to signaling systems and has for its obj ectthe provision of an im proved selective signaling system of the step-bystep variety and also novel features in connection with answer-back arrangefments in connection with signalingsystems of this character. a

My invention is of particular utility'in connection with railway lines and in the-description herein I will describe a system em-' bo'dying myinvention whichis of particular with an. electric railutility in connection wav line.

Of course, the specific description in this application of one form of carryingout the invention is naturally not intended to limit the invention, but this specific description is illustrative in character, from which the broad features of the invention may be readily deduced as pointed out in theappended claims. I r y I will describe this particular embodiment of'my inventionin connection with the. ac-

companying drawings illustrating the same applied as aforesaid, in which: I

Figure 1 is a side view of-animproved selector constructed in accordance with my invention, the casing whereof is shown in section; Fig. 2 is a partial sectional view on line a-a of Fig. 1; Figs. 3, 4, 5 .and 6 are views illustrating the various operative po sitions of a movable element of the device, and Fig. 7 is a diagrammatic circuit arrangement showing'the inclusion of the selector in a signaling system.

I will describe fii'stly a specific embodiment of a selector which may operate in accordance with my invention by particular reference to Figs. 1 to 6 inclusive. This selector operates in general alongthe lines set forth in' the patent to W. S. Burnett, No.

An armature 6 oscillatingly mounted upon Specification of Letters Patent. Patented Dec. 15, 1914; Application filed April 30; 1912. Serial No. 694,214.

970,1 0, issued'Sept. 13, 1910. Ithus have two coils 1, 1 forming a single winding which magnetize two separate and distinct magnetic circuits. cuit consists of the essential C shaped core 2 whose legs pass interiorly of the coils 1, 1 and terminate in pole pieces 3, 3, and thus form one magnetic'circuitrthe other magnetic circuit comprises the heel piece 4: and the cores 5, 5 which project through the coils pivots 7, 7 is associated with the cores 5, 5 and'tliis armature is polarized by the permanent magnet '8 so that this armature doccupies either one or the other of its two al- The first magnetic cir-- ternative positions, depending upon the polarity' of the current last impressed on the coils 1,1. An alternating current through the coils l, 1, will of course oscillate the armature 6-with a frequencyequal-to the frequency of the impressed alternating current provided naturally the frequency is not "too high to permit the said armature 6 to follow properly. a

A second armature 8 is mounted in close proximity to the'pole pieces 3, 3 and is-secured to a swinging element 9 pivoted at 10, which swinging element by reason of its overweight 11 tends normally to occupy thelikewisesuflicient to close contact between springs letand 15 through the agency of the insulating button 16 preferably'fastened to the spring 15' and abutting against this swinging element 9. This swinging element 9 has its central vertically arranged portion preferably plate shaped and the armature 8 forms a segmental piece at right angles to this plateshapedportion 9 so that this armature 8 is substantially parallel to the pole pieces 3, 3.

The magnetic elements above referred to are allv suitably mounted upon a supporting plate 17 to which a hood 18 may be fastened so as to entirely inclose the working .por

tain'operating parts as will presently 'ap 7 l pear. An opening 22 in this framework per-' mits the pin 20 to pro ect therethrough freely. I

--for this purpose. This shaft likewise The rotatable plate 13 is providedwith a notch 23, which notch is angularly displaced in. the different, selectors corresponding to different substations, to therebycontrol the,

selective feature of the device. This plate 13 is pivotally mounted between the framework 21 and an upright2 l secured to the framework 21, a shaft 25 being provided carries a toothed wheel 26 and a .pronged plate27, which plate27, plate 13 and wheel 26 are securely fastened to the shaft 25. The plate 27 has three projecting elements,

. one an arm 28 which is used to-come into" contact with the pin 20 when the devices are being restored to their normal position; an arm 29 adapted to contact with a limit guard or jarm 3O fastenedto, the armature 6 and movabletherewith so as to prevent further operative rotation of thewheel 26- by the armature 6 when the arm 28 engages thepin 20; and an l. shaped arm 31 pro ect.

ing toward the periphery of the platel3 and. then downwardly therefrom so j as -to be engaged by .the projection 12 after the entire signaling and restoring operation has ceased, sons to more the shaft25 a space of one-half cycle into its initial starting position to thereby carry the arm 28 out of the jection of the arm 31 is engaged by the projection 12 of the movable element 9 that the movable elements carried by the shaft 25. are rotated a short space to bring them to g g then additional impulses are sent to move their starting position. v

ln order to set the devicean escapement lever is provided 'WlllCll is secured to the shaft 33 pivotally mounted betweenthe standard 24 and the framework 21. This lever 32 has the arms 3- 3- whereby an oscillation of this arm causes a rotation of the shaft 25 by reason of the engagement of the prongs of the arms 3% with the toothed equivalent and each cycle of current, that is, one positive and one negative impulse move the rotatable elements one step. Thus for each cycle there is one engagement between the wheel 26 and each one of the prongs car- 7 .ried by the arms 34.; Naturally if but a half cycle is sent of such polarity to reverse the position of the armature 6, then the movable,

elements rotate but one-half step. This oscillating arm 32 is oscillated by means of I a pin 36 carried by the arm 30. Thus whenever the armature 6 oscillates, the escape- 'ment arm 32is oscillated and thereby'the selective elements of the device are rotated therein. the position shown-in- Fig/ 3, whichiissthe starting position, assuming also vthat .the

armature 6 is-in the positionshown in Figsuch a position that two complete cycles must be sent in order for this particular device to respond. Assumethen that two complete, cycles, that is, two positive and two negative impulses are receivedbythe armature, then each arm ofthe escapement mechanism will have engaged the. wheel26 twice and it will have moved four half steps. The initial, impulse likewise rotates "the swinging element 9 in a contra-clockwise. die

rection so that'its projection 12 isv away.-

Now assume'that the device is in. I

from the periphery of the wheel 13 and it 3 remains in this position during the sending of the lmpulses. After the impulses have finally ceased, this arm 9 swings around by. reason of the weight 11 and the projection 12 enters the notch 23 in 'whichposition, circuit is closedbetween springs l-l and 15.

Of course, only those devices respond I in which the notches directlyregister with the projection 12 as shown in Fig. 5, because in the other devices the projection merelyjfalls against the periphery of the wheel 13 andin such a position the contact between the springs 14 and 15 is not closed. -Assuming I now that the station has been called andit is desired to restorethe devicesto normal,

the rotatable element progressively around so as to complete-its rotation back to its starting point. ;The armature 6 is thereby oscillated by additional impulses, the first impulse having withdrawn the projection 12 from the'notch23and .these impulses are i sent in a number exceeding the number re quired to complete the rotation backto,the

the movable elements move only to the Y .sition indlcated 1n F1g. 4, irrespective of the excessive number of cycles received. In th1s- 1 position illustrated in Fig. 4the arm 30 likewise is opposite the arm 29 and even though excessive cycles are received the escapement element 32 no longer engages the teeth of the wheel 26 as the armature 6 is prevented from moving its required. operative distance by the engagement of its arm "mitting the swinging element 9 to assume the position shown in Fig. 2. While this element 9 is assuming this position, itsprojection 12 engages the cam shaped portion which may be likened to a'counting pole changer whereby to send the necessarycycles to-call any desired station.v Such acounting device, of course, must havea number of given setting positions depending upon the number of stations .on the line. Now in order to increase the capacity ofthe system.

without increasing the size of call boxes by increasing then setting positions, I provide a reversing element *at the sending station so as to reverse the polarity of the current nnpressed whlch practically amounts to the same thing as ellminating the first impulse,

and in this manner the shaft 25 will be stopped a half cycle earlier than would be the case if the ordinary number of cycles were sent without the reversing" device.

This may be more readily understoodby assuming that the device shown in Fig. 1 is designed to respond after two complete cycles have been sent, which means two positive and two negative impulses. Assuming that the last impulse is always a negative impulse which leaves the armature 6 inthe. position shown In F1g. 1, then the first -1rn-= pulse naturally should always be a positive impulse. Thus four impulses, two positive and two negative, beginning with a positive tive, positive, negative, these four impulses are sent negative, positive, negative, pos1-- tive, then it will be readily apparent that the first negative impulse will not move the armature 6 and the three succeeding impulses will move the shaft .25 through a space of one and one-half cycles. The same reasonlng applies with any number. For 1nnanner I may increase the capacity a certain numstance, if we have a station that would re spond to six cycles and we used the reversing switch, then the particular elements of the substation would stop at five and onehalf cycles. In this case, of course, the notches 23 must be made narrower than shown in the figures so that each notch has a width corresponding only to a half cycle movement of the shaft 25 as will be readily apparent, and of substantially the width of the projection 12.

It will thus be seen how in a very simple of the device under discussion. r Referring now particularly to Fig. 7, wherein I show my device as of use, I have a central station A and a substation B, although other substations are intended to be added to the number required. I have indicated the selector described in Figs. 1130 6 inclusive at thesubstation B by the coil 1, the rotating plate 13, and the movable element 9, thismovable element closing circuit through the springs 14 and 15. The device is connected in bridge of the line wires 37 and 38, which linewires unite the stations together. An adjustable resistance 4O is provided serially with the device to adjust for. line conditions. A lightning arrester 41 is shown as likewise fuses 42, 42. At the central station I have a pole changing device as explained more in detail in my co-pend-.

ing application Serial No- 694,215, filed April 30, 1912, in which a shaft 43 carries two conducting rings 44 and 45 respectively associated with commutator segments 46 I and 47 i Brushes 48 and 49 are associated with the commutator segments and brushes 50 and 51 are respectively associated with the rings 44 and 45. The shaft 43 is suitably rotated to transmit cycles (each cycle meaning a positive impulse and a negative impulse) and a suitable counting mechanism to count the number of cycles is utilized to operate the shaft 43in accordance with the disclosure made in my co-pending application Serial No. 690,727, filed April 15, 1912. A battery 52 furnishes the current. i A condenser 53 is bridgedacross the line wires to take the discharge due to sparking and a non-inductive resistance 54 is bridged across the condenser so that the condenser discharge will not operate the selectors. The

shaft 43 may then be operated to call any desired station. In order to operate the device so that it may occupy one-half cycle positions I use a reversing key 55 which merely reverses the polarity of the battery current from the battery 52 as supplied to the brushes'50 and 51. I utilize a key56 which when operated closes'the battery circuit to the pole changer and also closes the battery circuit from the pole changer to the line. I show a second key 57 which is associated with an operators telephone set 58 and which connects-this operators telephone.

set in bridge ofthe line for talking purposes as will be readily apparent. l likewise pro thereupon establish a circuit from spring 15,,

through conductor 66, relay 6.7,; conductor 68, visual signal 69 for the motorman, resistance 70, hand switch 71, trolley wire. 72, generator -73, ground 74, ground 75, con- 7 'ductor 76, spring 7?,spring 78,conductor erated by means of the spring 85 in a con- 7 9, spring 1a, contact element v80 to spring 15. The lamp 69 is thus lighted somewhere along the right of way to call a trainman and at thesame time the armature 81 of the magnet 67 is attracted to operate a catch82 to thereby release an answer-back mechanism and at-the same time to close. circuit.

; through springs 83 and 84:. Closing the cir+ cuit-through thesprings 83 and 84Lplaces a closed circuit across the springs. 14: and

so that the substation callingdevice may be restored without breaking the continuity of the circuit through the relay 67 and signal 69." The answer-back device is spring opitra-clockwise direction sothat the arm 86 engages, a stop 87, during which motion a segmental wheel 88 is operated toperiodically close circuit between springs 89 and .90,

thereby periodically grounding the line wire 37 to operate the relay in response to said groundings. rives at the signal 69 heinserts a plug 91 into the jack .92 and may then converse by means of the telephone set 93 with the train despatchers telephone apparatus 58.

It may be said, of course, that the operations of the answer-back device are registered upon the register to indicate that p the proper substation instrument has been selectively operated. The trainman then operat'esthe handle'86 in a clockwise direction from the position it has occupied against the stop 87 into the position it occupies in the illustration, at which time this arm has opened circuit through the springs 7 7 and 7 8, thereby breaking circuit through the relay 67 to permit the restoration of all parts to normal and again holding the answer-back device by means of the detent 82;

This restoration of the answer-back device winds it up so as to be ready for another opa station is selected, contact is As soon as the trainman aroration. Av switching key comprising. the springs 94: andl95 at each substation may be used to ground the line conductor v 37 to; thereby manipulate the registering device; 65 so that thetrainman may signal the cen-l traloflice should communication be desired,

While I have herein'showni and particularly described one vform of carrying out'my invention, Ido not meanto limit 'myselfit'o such specific description and illustration, 'buta. r w g Having thus described oneembodiment of; j

my invention, what 'I claim as newand'desiretosecure byLetters Patent is:

1., A signaling system having a central station and'substations all united by the same circuit, and including a, step-by-step signal receivingdevice at. each substatio'ra; means at theicentral station operable'over' said circuit to select for operativeioperation any substation, I an answer-back device at each substation adapted to send indications over said c1rcu1t,'a signal at each substation,

meansfor normally preventinglsaid answerbackdevice from operating, means whereby the answer-back device is released whenever its corresponding signal is operated, means" for restoringisaid answer-back device and effacing said signal, a signal receiving-dew vice at the central station adapted to receive saidanswer-back indications, and means at each substation operable over saidcircuit to actuate said central stationsignal receiving 7 device independently "of said answer back device.- 7 v i,

2. A signaling system" having a centralstation and substations all united by the same circuit, and includingstep-by-step signal receiving device at each substation,

means atthe'central station. operable over said circuit to select for operative operation any substation, an answer-back device I ateachsubstation adapted to send indications over said circuit, a signal at each substation, .means for normally preventing said answerback device from operating, means whereby the answer-back device is released whenever its corresponding signal is operated, means for restoring said answer-back device and effacing said signal, and a signalreceiving device at the central station adapted. tore- 1 ceive said answer-back indications, said an-' swer-back releasing means having lmeans under lts control to actuate said signal.

3. A signaling system having a central station and substations all united by'the same circuit, and including a step-by-step signal receiving device at each substation, means at the central station operable over said circuit to select for operative operation any substation, an answer-back device at each substationadapted to send indications over said circuit, a signal at each substation,

means for normally preventing said answer back device from operating a relay whereby the answer-back device is released whenever its corresponding signal is operated, means for restoring said answer-back device and efiacing said signal, a signal receiving device at the central station adapted to receive said answer-back indications, and means whereby said relay when'actuated maintains its actuated position, said restoring means controlling the restoration of said relay.

4. A signaling system having acentral station and substations all united by the same circuit, and including a step-by-step signal receiving device at each substation, means at the central stationoperable over said circuit to select for operative operation any substation, ananswer-back device at each substation adapted to send indications over said circuit, a signal at each substation, means for normally preventing said answer-back device from operating a relay whereby the answenback device is released whenever its correspondingsignal is operated, means for restoring said answer-back device and efi'acing said signal, a signal receiving device at the central station adapted to receive said answer-backindications, and means whereby said relay when actuated maintains its actuated position, said restoring means controlling the restoration of said relay, said central station selecting de vice including a pole changer.

5. A signaling system having a central station and substations all united by the same circuit, and including a step-by-step signal receivingdevice at each substation, means at the central station operable over said circuit to select for operative operation any substation, an answer-back device at each substation adapted to send indications over said circuit, a signal at each substation, means for normally preventing said answer-back device from operating means whereby the answer-back device is released whenever its corresponding signal is operated, means for restoring said answer-back device and efiacing said signal, and a signal receiving device at the central station adapted to receive said answer-back indications, said answer-back device having means under its control to actuate said signal receiving device,'said central station selecting de vice including a pole changer, a condenser bridged across said circuit, and a non-inductive resistance bridged across said circuit.

6. A signaling system having a central station and substations all united by the same circuit, and including a step-by-step signal receiving device at each substation, means at the central station operable over said circuit to select for operative operation any substation, an answer-back device at each substation adapted to send indications over said circuit, a signal at each substation, means for normally preventing said answer-back device from operating a relay whereby the answer-back device is released whenever its corresponding signal is operated, means for restoring said answer-back device and eiiacing said signal, a signal receiving device at the central station adapted to receive said answer-back indications,

and means whereby said relay when actuated maintains its actuated position, said restoring means controlling the restoration of said relay, said central station selecting device including a pole changer, a condenser bridged across saidcircuit and a non-inductive resistance bridged across said circuit.

the, central station to reverse the polarity of the cycles so that said substation signal receiving device can also occupy positions correspondingto one-half cycles.

8. A signaling system having a central station and substations united bya circuit, a step-by-step signal receiving device at each substation having escapement operating means adapted to occupy two resting positions per'impressed cycle of alternating current, one of said positions being its normal starting position, devices at the central station for impressing cycles of operating current to operate said step-by-step device into different operative positions corresponding respectively to the impressed cycles, and a switching device at the central station to reverse the polarity of the cycles whereby said escapement means and said substation signal receiving devices occupy resting positions corresponding to half cycles.

9. A signaling system having a central station and substations united by a circuit, a step-by-step signal receiving device at each substation having escapement operating means, devices at the central station for impressing cycles of operating current to operate said stepby-step' device into difierent operating positions corresponding respectively to the impressed cycles, a polarized operating armature at each substation to control the operation ofsaid escapement occupying a normal resting position from which it is responsive to the polarity of current forming the first'impulse of each cycle,

and a switching device at the central station to reverse the polarity of the impressed In Witness whereof, I hereunto subscribe cycles whereby the substation polarized my name this 5th day of April, A. D., 1912. armature remains unresponsive to the first OTTO T. LADEMAN. impulse so that the substation step-byste'p Witnesses: 1

5 device will occupy positions intermediate to MAX W. ZABEL the cycle positions. HAZEL JONES.

Copies of this patent may be obtained for five cents each, .by addressing the Commissioner of latents,

Washington, D. C. v

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